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Summary: Protected Ctors | Methods | Inherited Methods

# TimerTask

`public abstract class TimerTask`
`extends Object` `implements Runnable`

java.lang.Object
↳ | java.util.TimerTask

A task that can be scheduled for one-time or repeated execution by a Timer.

See also:

- `Timer`

## Summary

### Protected constructors
`TimerTask()` Creates a new timer task.

### Public methods
`boolean` | `cancel()` Cancels this timer task.
`abstract void` | `run()` The action to be performed by this timer task.
`long` | `scheduledExecutionTime()` Returns the scheduled execution time of the most recent actual execution of this task.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Runnable`
`abstract void` | `run()` When an object implementing interface `Runnable` is used to create a thread, starting the thread causes the object's `run` method to be called in that separately executing thread.

## Protected constructors

### TimerTask

    protected TimerTask ()

Creates a new timer task.

## Public methods

### cancel

    public boolean cancel ()

Cancels this timer task. If the task has been scheduled for one-time execution and has not yet run, or has not yet been scheduled, it will never run. If the task has been scheduled for repeated execution, it will never run again. (If the task is running when this call occurs, the task will run to completion, but will never run again.)

Note that calling this method from within the `run` method of a repeating timer task absolutely guarantees that the timer task will not run again.

This method may be called repeatedly; the second and subsequent calls have no effect.

Returns
`boolean` | true if this task is scheduled for one-time execution and has not yet run, or this task is scheduled for repeated execution. Returns false if the task was scheduled for one-time execution and has already run, or if the task was never scheduled, or if the task was already cancelled. (Loosely speaking, this method returns `true` if it prevents one or more scheduled executions from taking place.)

### run

    public abstract void run ()

The action to be performed by this timer task.

### scheduledExecutionTime

    public long scheduledExecutionTime ()

Returns the scheduled execution time of the most recent actual execution of this task. (If this method is invoked while task execution is in progress, the return value is the scheduled execution time of the ongoing task execution.)

This method is typically invoked from within a task's run method, to determine whether the current execution of the task is sufficiently timely to warrant performing the scheduled activity:

    public void run() {
           if (System.currentTimeMillis() - scheduledExecutionTime() >=
               MAX_TARDINESS)
                   return;  // Too late; skip this execution.
           // Perform the task
       }

This method is typically not used in conjunction with fixed-delay execution repeating tasks, as their scheduled execution times are allowed to drift over time, and so are not terribly significant.

Returns
`long` | the time at which the most recent execution of this task was scheduled to occur, in the format returned by Date.getTime(). The return value is undefined if the task has yet to commence its first execution.

See also:

- `Date.getTime()`

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